Question:A class has two section, in one of which there are `40`students with an average of `14.5` years .The average of the class is `14.2`years .If there be `32`students in the other section ,its average age is : 

A `13.5 years` 
B `13.6 years` 
C `13.7 years` 
D None 

+ Answer
D 

+ Explanation
Total age of `32`students 

`= (72 xx 14.2 - 40 xx 14.5) years`

`= (1022.4 - 580) years`

`= 442.4 years`

:. Required average

`= 442.4/32`

`= 13.825 years`

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Irin Moni

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